Watson Grinding explosion trial (3M expert)

What happened

A January 2020 explosion at the Watson Grinding and Manufacturing facility in Houston killed 3 people and damaged about 200 nearby properties. Residents sued several parties, including 3M, over a gas detection system at the site. For one of the trials, 3M retained Josh Autenrieth of KnightHawk Engineering to give expert testimony on the standard of care. This entry rests on news reporting. No court filing was located.

According to 404 Media, which first reported the story, plaintiffs' counsel Will Moye noticed a document titled "Citation Overlay" in discovery and demanded the prompts used to prepare the report. About 350 pages of ChatGPT conversations were produced. The reported prompts include requests to "create an exceptional expert witness report defending the standard of care at 3M" and to "show how 3M is 0% at fault for the explosion." Reports also describe the expert uploading case materials and a photograph of a gas detector and asking the system "what am I looking at?"

What the court did

No ruling excluding or striking the expert's testimony was reported. The expert testified at trial and was examined on the chat logs. As reported, counsel and the expert agreed on the stand that the report was "90 to 85 percent ChatGPT." The expert testified that "AI helped me to draft a straw man to build off of" and pointed to his more than 20 years of industry experience.

The Harris County jury awarded $61.5 million to 24 plaintiffs and found 3M 30% responsible for the explosion, according to the plaintiffs' firms' announcement of August 11, 2026. That announcement does not mention the expert or AI, and nothing in the sources reviewed ties the verdict to the expert's testimony.

Where it stands

The verdict was returned in August 2026. Post-trial motions and any appeal were not located. The judge was not identified in the sources reviewed, and the case caption reported in secondary sources was not confirmed against a court record.

The obligation it engaged

The reported prompts engage Clause 1, sequence, and Clause 2, non-delegation. A prompt asking a system to show that a party is 0% at fault states the conclusion before the analysis, and a report that is mostly generated text leaves the court to ask which opinions are the expert's. The expert's answer at trial, that the system drafted a straw man he built on, is a claim that Clause 2 was met. The logs were the evidence used to test that claim.

The matter also shows Clause 7, contemporaneous record, operating in an unexpected direction. The chat history served as a complete record of the process, and once produced it became the main subject of cross-examination. An expert whose use of a system is ordered correctly under Clause 1 has little to fear from producing such a record. Clause 8, disclosure, applies because the use came to light through discovery rather than from the report itself.

Sources

• 404 Media · August 17, 2026
  'Show How 3M Is 0% at Fault:' Expert Witness Used ChatGPT to Write Report Defending Company in Deadly Explosion Lawsuit
• PR Newswire · August 11, 2026
  Harris County Jury Awards $61.5 Million to Survivors of Watson Grinding Explosion, Holds 3M Accountable
• Futurism · August 18, 2026
  Man Obliterated When Court Obtains His ChatGPT Transcripts

What could not be confirmed

News only; no court filing located. The 404 Media article is paywalled and only its opening was read; trial testimony quotations come from outlets summarizing it. Accounts differ on how the logs were obtained: several describe a demand at deposition followed by production, while Futurism says the judge ordered disclosure. The caption Laake v. 3M Co., No. 2020-05505-A (11th Dist. Ct., Harris County) appears in a secondary summary and was not confirmed. The judge, any motion to exclude, and whether the expert testified in the same trial that produced the $61.5 million verdict were not confirmed in a primary source.